基于影响线的混凝土桥梁疲劳寿命预测分析

文章基于影响线分析提出了多轴车辆作用下的混凝土桥梁疲劳损伤当量分析及疲劳寿命预测方法。以一座预应力混凝土连续箱梁桥为例,基于动态称重系统制定当量车荷载模型,分析不同程度车辆荷载作用下桥梁疲劳损伤发展规律,结果显示车辆荷载与疲劳损伤之间存在着非线性指数发展规律,采用疲劳损伤当量分析预测得到的疲劳寿命与传统当量车方法一致。

Based on the analysis of influence lines,a method for fatigue damage equivalent analysis and fatigue life prediction of concrete bridges under the action of multi-axle vehicles is proposed in this paper.Taking a prestressed concrete continuous box girder bridge as an example,the equivalent vehicle load model is established based on the dynamic weighing system,and the fatigue damage development law of the bridge under different vehicle loads is analyzed.The results show that there is a nonlinear exponential development law between vehicle load and fatigue damage,and the fatigue life predicted by fatigue damage equivalent analysis is consistent with the traditional equivalent vehicle method.